Francis keil



(Model.)

F. KEIL.

LATCH.

No. 340,323. Patented Apr. zo, 1333.-

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FRANCIS Kan., oF lNEW' YORK, N. Y.

LATCH.

Application filed January 18,1886. Serial No. 188,997. (ModelJ Fo all whom it may concern.-

Beit known that I, FRANCIS KELL, of the city, county, and State of New York, have iuvented a new and Improved Latch, of which the following is a full, clear, and exact description.

The object of this invention is to improve the construction of that class o f latches known as night7 or safety latches.

The invention consists in a novel construction and arrangement of locking devices in connection with the dog by which the bolt is retracted by means of a key from the outside of a door. The invention further consists in a peculiar form of vkey for the outside locking mechanism. The invention also consists in details of construction and arrangement of parts, as will be hereinafter more specifically set forth.

Reference is to be had to the'accompanyi'ng drawings, forming part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is aplan view of the back of the latch with the hack plate and outside locking mechanism removed, the bolt being shown held in the inner position. Fig. 2 is the same view with the parts as when the bolt is in the outer position, the bolt being shown in dotted lines, the dog for retracting the bolt from the outside being in place, and parts being in sec tion on the line x x, Fig. 3. Fig. 3 is a central longitudinal sectional View of the latch on the line y y, Fig. 2. Fig. 4 is a transverse sectional view on the line z z, Figs. 3 and 7. Fig. 51s a transverse sectional view on the line u u, Fig. 7, showing the key inserted and the tumblers withdrawn. Fig. 6 is a cross-section on the line o o, Fig. 5. Fig. i' is a sectional plan View on the line w w, Fig. 4. Fig. 8 isa plan View of the housing. Fig. 9 is a plan view of one of the tumbler-s. Fig. l0 is a side View of the key.

The bolt A, held to slide in `the casing B, is kept normally in the outer positionv by the spring C, and can be moved to the inner position by the knob D. E is the back plate ofthe casing, held in place by a screw entering the socket h. The bolt A is recessed at its front side at a, and its inner end is forked to form the prongs b b. Lugs c c extend from the ends of these prongs to the plane of the front side of the bolt. Lugs d d project from the inner side of the back E to the prongs b b, and lugs e e on the front of the casing hold'the bolt against lateral movement. Back of the head f of the bolt is an aperture, g. A locking dog, F, is pivoted to the bolt A and located between said bolt and casing in the recess a by a stud. fi, fitting loosely in the aperture g. From the free end of this dog astem, j, or handle projects through an Lvshaped slot, G, in the front of the casing, upon which stem the manipulating-knob D is secured, (or the stein may be formed on the knob and riveted to the dog.) On that side of the dog F adjacent to the short arm of the slot G is a hooking, k, and on the front of the casing, in position to be engaged by thehook. lc, is a lug, Z, having its engaging end beveled approximately on a circumferential line from the aXiscfst-ud i. Forward of the lug Z is a stud, m, around which is passed the coil of the spring C, one end of which spring bears against a lug, o, and its other end against the stem of dog F. By this construction and arrangement of the parts the bolt can be slid inward, and is free to be thown outward by the spring, the tension of the spring holding the hook It away from the lug Z. "When it is desired to hold the bolt in the inner position, the stem j, after being moved to the inner position, is shifted sidewise into the short arm of the slot G, whereby the hook k is engaged with the lug Z, and is held engaged by the spring holding the dog F and bolt A.

On the inner side of the face of the casing B, between the prongs b b, is the stud n. A tubular housing,'H, projects from the back plate, E, the axis of which housing coincides with that ofthe stud n. At the outer end of the housing` H is an internal annular tlange, IL', and at diametrically-opposite points of the interior of the housing are formed the longitudinal grooves 1).

VOn the stud n is mounted the retractingdog 'K, the arms g of which engage the lugs c c of bolt A. For operating the dog K and locking it against being turned, I provide the mechanism now to be described. The barrel L, attached to or formed integral with the dog K, extends outward therefrom into the bore of the housing H,which it ts snugly. The barrel L is slotted diametrically at M, the width Y which extend to the sides of slot M.

of the slotbeing the same as that of the groove 1J.' The slot M extends from the dog K about two-thirds the length of the barrel. From the slot M the slit r extends to the end of the barrel, said slit being in line with and central of the slot M. Two extensions of said slit or rab; bets r' are formed in the side parts of Vthe barrel at the opposite corners of the slit r, In the slot M ou the pins s and tare pivoted the three tumblers, N, O, and N. The central tumbler, O, pivoted near the bottom of the slot M on the pin s, is ofa width equal to the diameter ol" barrel L, and is provided in its free end with the recess u, forming the two points n and u, the points being toward the outer end of the barrel. The tumblersN N are pivoted on the pin t near the upper end of the slot M, the pin passing through the apertures w ot' the tumblers. The spring through the central coil of which the pivotpin t passes, is held thereby in the recess u of the tumbler O, and the ends ol' this spring bear, respectively, upon opposite ends ofthe 4 inwardly extending arms nof the tumblers N and N', forcing the points n? n2 ofthe tumblers into the grooves p ot' the housing. The tumbler O is free to turn upon its pivot by gravity, so that if the latch is used either as a right or left hand latch one of its points n or o will engage a groove, p. The tumblers N and N are each cut away or shaped yto form on the side opposite the point a the shoulder n", the position of which will be varied for different latches. The points n2 of the tu mblers N and N and one ofthe points of the tumbler O are normally engaged with the grooves p of the housing H, 'and hold the barrel L from heilig turned without a suitable key. For turning the barrel and withdrawing the bolt, I provide the key shown in Fig. l0. This key corresponds in cross-section with the slit r r in the barrel L, and consists of a iiat portion or body, R, and .two oppositely-extending marginal flanges, S. As shown, one of the flanges S is slightly cut back from the entering end of the key,to form a shoulder, p', which is positioned to engage the shoulder n of the tumbler N. The outer :iiange S is left with its shoulder p flush with the end of the key. The part R of the key is recessed at p3 to form the points g', which are preferably rounded on theirouter edges for engagement with the points' o c of the tumbler O. The anges S can be cut away to position the points pp at any point required by the position of the shoulders yn3 of the tumblers N N. The recess p3 is made of a depth so that the pivot-pin t shall come to bear in the base of said recess when the tumblers are fully withdrawn into the barrel, and so prevent further endwise movement of the key, and consequent throwing of the tumblers too far. Vhen the key Q is entered into the slit r, one of the points q will engage one of the points o c of the tumbler O. A further endwise movement of the key will engage the shoulders p' p2 with the shoulders n3 of tumblers N N, and will withdraw all the tumblers into the barrel L, when the barrel can be turned and the bolt A moved to the inner position.

l do not limit myself to the arrangement shown of the tumblers, nor to the position of their operating-shoulders, nor to the position of the shoulders on the key, as the same may be differently arranged within the scope of my invention.

Having thus described my invention, whatl claim as new, and desire to secure by Letters Patent, is

1. The combination, with a latch casing provided with an L-shaped slot and a sliding spring-actuated bolt, ot'a dog pivoted at one end to said bolt, and provided at its free end with a stem extending through said L-slot in the casing, and with a hook-lug adjacent to said stem, and cf a lug on the casing adjacent to said L-slot, substantially as shown and described.

2. The combination, with the springfactuated bolt of a night latch, an armed dog for retracting said bolt, and a grooved housing on the latch-casing, of a slotted barrel integral with said dog, springactuated tumblers pivoted in said barrel, and a gravity-tumber also piv'otedf in said barrel, substantially as shown and described.

3. The combination, with a grooved housing, a barrel iitted to turn therein, and a gravity-tumbler pivoted in said barrel, of two tu mblers pivoted in said barrel at the sides of and opposite to said gravity-tumblers, and each provided with arms extending toward the pivot ofthe gravity-tumbler, and a spring acting on one arm of each of the said two-armed tu mblers, substantially as shown and described.

,4. The combination, with a grooved holising, of a diametricallyslotted barrel formed integrally with the retra-etingdog of the latch and held to turn in the housing, and tumblers pivoted in the said barrel and normally engaging the grooves of the housing, substantially as shown and described.

5. The combination, with a retracting-dog and a barrel projecting from the same, provided with tumblers normally engaging grooves in the housing of the barrel, and provided with operating-shoulders, substantially as set forth, of' a key having shouldered anges to engage the shoulders ot' said tumblers, substantially as shown and described, whereby an end wise movement of said key will withdraw the tumblers from engagement with the housing.

6. A barrel projecting from the retractingdog of a latch-bolt slotted diametrically for carrying locking-tumblers, and provided with a diametrical slit extending from the slot carrying the tu mblers to its outer end, and said slot having two side extensions, substantially as shown and described.

7. The combination, with a. slotted barrel carrying tumblers and provided with a slit having side extensions, substantially as set forth, ofa keyhaving a Hat main portion or body and edge flanges, and adapted to iit in said slit ofthe barrel, substantially as shown and described.

8. The combination, with a slotted barrel provided with shouldered tumblers and athreepart slit-as set forth, of a key having a dat main portion or body and oppositely-arranged side-danges, said flanges being cut away to form shoulders, and said main body being recessed at its operating end, substantially as shown and described.

' 9. A key formed With a dat main portion or body and with side anges, substantially as shown and described.

10. A key formed with a Hat main portion or body, and with oppositely arranged side franges, and said main body and lianges cut away to form engaging shoulders, substantially as shown and described.

1l. The combination, with a diametricallyslotted barrel, of a. tumbler pivoted at one end centrallyin said barrel, and provided at its free end at each corner with a point extending in lines parallel with the longitudinal axis of the dog, substantially as shown and described.

12. The combination, with a slotted barrel. of two oppositely arranged tuinblers pivoted therein, each provided at one end with an engaging-point and an operating-shoulder, and at the other end with two opposite arms, vand ofa spring acting on one arm of each tumbler, substantially as shown and described.

13. The combination` with a grooved housing. and a slotted barrel held therein, of the tumbler O, having the points o c', the pivotpin s, the tumblers N N,having each the arms n', point n2, and shoulder n3, the pin t, and the spring al', substantially as shown and described.

14. The combination, with the casing B, having stud a, and the bolt A, of the dog K, mounted on said stud and carrying the slotted barrel L, the housing H, carried by the back plate and having the ange h', the tum blers N O N', pivoted in said barrel. and theA spring x, substantially as shown and described.

15. The combination, with the bolt. the retracting-dog, the barrel L, carrying the lockingtuxnblers, and provided with the slit 1'1",

ofthe housing H, having the grooves p and flange h', substantially as shown and described.

FRANCIS KEIL.

Witnesses:

EDGAR TATE, W. S. WALKER. 

